Mold



Sept 27 1927' v. A. T. ALBRlH-r MOLD Filed Jan. 12, 1926 3 Sheets-Sheet 2 Sept. 27,1927.

v. A. T. ALBRIGHT MOLD Filed Jan. 12. 1926 y1,643,1as1

3 -Sheets-Sheet" 3 im; :www

INVENTOR ATTORNEYS Patented Sept. 27, 1927.

-, UNITED viirxrjnlvT. OFFICE.

Vieron A. fr. ALBRIGHT, or BEDFORD, INDIANA.

Y MOLD.

Application filed January 12,!1926. zserialrNo. 80,730.v

elements Aduring the casting operation, by

the provision ot' means't'or permitting' the escape of gas during the casting operation, by the provision of means making possible utilization of majorvportion of the mold elements lin casting'dife'rentsized teeth, and by the provision` of means for insuring proper assembling and positioning'` of the several elements entering intov the mold for agiven size of tooth. i

Other' objects and advantages of the invention will becomeiapparent from't-he: following description when taken in connection with the accompanying'drawings in whichliligure 1 is a side elevation of a" mold ern- -bodying my invention, a portion thereof being broken away to show the relation of' a mold cavity to its gate.

Figure 2 is al view. showing, in 'side' elevation. elements of themold detached one from another, the side pieces being arrangedso as to show their inner faces, i. e., the side piecesl shown to the left have been'turned about so as to show in front their inner faces which lit against the front of the base piece, shown in the middle, and against lthe inner taci-s ot the rear side pieces, shown to the right.

Figure?) is an enlarged transversev sectional view, taken on the line 3*-3 of Figure 1.`

Figure 4 is a view similar to Figure 3but on a larger scale, showing the middle portion of the mold and the lower portion of al tooth cast within the mold.

Figure 5 is a horizontal sectional view, taken on the line 5 5 of Figure 3 and showing a single mold cavity.A

Figure 6 is a top plan view ofthe mold. adjusted to cast a tooth of a` given dimension.

Figure 7 isa view similar to Figure 4-6 showing the moldY adjusted to cast awid'er tooth.

nFigure Sis affragmentary side elevationv of the parts of the mold, with'the upper'side pieces slightly separated from the lower side pieces and base piece, and withv the upper side piecesadj usted to the relative positions shown in Fi-GfureV 6, i. e., to produce narrower. teeth, and 'with the proper base -pieee'associated -with Vthe lower`V side pieces tol complete the mold andvto insure'fsuch-adjustment ofthe upper side pieces.

.Figure 9 is a' view similar to-Figuref8 but with the upper side piecesl adjusted tothe relative positions shown in. Figure 7, i. e., to produce widerteeth, and ywith the proper base piece to complete the-moldand'to insure such adjustment of `rthe upper -side pieces.

Figure 10 is a fragmentary planvi'ew of the lowerside pieces-associated withay base piece provided with aimodiied form of venting means. Y

Figure l11 is a transversefsectionalview, taken on lthe line 11-11 of Figure 10.

vFigure 12 4is a transverse sectional view,

taken on the line 1Q-120i Figure 13 and showing. another modified form of venting means. y .Figure 13 is a fragmentary side elevation of 'the 'base-piecef'but vwith only one of'lthe two lower sideppieces associated therewith. Figure 14 is a plan view of the two lower .ide pieces associated with a ibase piece and between which arev arranged spacers for spacing the cutting elements from `the ends of'themold cavityv and over which mold cavity is arranged a screen, partly broken away, for4 preventing thecutting elements from fioating upward when molten metal is introduced into the mold.

Figure 15" isa view in elevation of a loeating pin adapted to cooperate with the partsof' the mold to insure proper adjustment of the upper side pieces when assembling the mold -Jfor different zsi-zed teeth.

kReferringto-the drawings, and particu-- la'rly to Figures 1 to 9 inclusive, wliereinon'er form of the'invention is shown, the mold enibodying Vmy invention comprises a Abase aiece 15, upon whichy are arranged two lower `side pieces 16, ea'cli carrying an-upper side piece 17`and 18,v respectively.y These tive elements when assembled'iformA a-plurality of mold cavities 19 and are held together by means of a pluralityof horizontally and transversely disposed lag-bolts 2O and 21, and a plurality of vertically disposed tie-bolts 22, the heads of V'which are adapted to fit loosely wit-hin a groove or channel 24C formed longitudinally at the bottom of t-he base piece 15, and to be held from turning by the walls thereof. This groove or channel not only receives the bolt heads so as to permit the bottom of the base piece to rest flatly upon a table or support and thus permit the assembled mold to stand in an upright position, but it also facilitates the assembling of the mold, since, by reason of the fact that the bolt heads are confined between the side walls of the groove or channel 24, the nuts carried at the upper' ends of the bolts may be run down into firm clamping engagement upon the upper, side piece without necessitating the application of a wrench or similar tool to the bolt head to prevent its turning.

The lower side members 16 are arranged upon the side ledges 25 of the base piece 15,

adjacent to the upwardly proj ecting tongue 26 thereof, and these lower side members eX- tend an appreciable distance above the tongue 26, as shown. The lag-bolts 21, which pass freely through one of the lower side members 16 and into screw-threaded engagement with the other of thelower side members, also pass through the tongue 26 of the base piece 15, and thereby serve as means for holding the base piece 15 and the lower side pieces 16 in assembled relation preparatory toassembling the upper side pieces 17 and 18. The upper side pieces 17 and 18 are mounted upon the upper faces of the lower side pieces 16 and, as before stated, are clamped thereupon by means of the verticallyarrangedtie-bolts 22, the upper side pieces 17 and 18 being clamped together by means of the transversely disposed lag-bolts 20, which are passed through elongated openings 27 formed inthe upper side piece 17 and into screw-threaded openings 2.8 of the upper side piece 18. Extensions or protuberances 29 on the inner face of the upper side piece 17, are adapted to fit into the space afforded between the upper and lower anges 30 and 31, formed on the upper side piece 18, and function cooperatively with the flanges 8O and 31, not only as a means for maintaining the upper side pieces 17 and 18 properly spaced but also as guide means for facilitating longitudinal adjustment of one upper side piece with respect to the other to vary the width of the mold cavities 19. The longitudinal adjustment of one upper side piece with respect tothe other is made possible by reason of the elongation of the openings 27 in the upper side pieces 17 through vwhich the lag-bolts 2O project.

The upper side pieces 17 and 18 form the side walls of the several mold cavities 19, andthe end walls of these cavities are formed by a plurality of abutments or sepayrators 32 and 82', secured respectively to the upper side pieces 17 and 18 by suitable means, such as screws 33. The upper ends of the abutments or separators 32 and 32 project an appreciable distance above the upper surfaces of the upper side pieces 17 and 18 and the lower Aends of these abutfments or separators project an appreciable distance below thel lower faces of the upper side pieces and into the space afforded between the two lower side pieces 16, which space is somewhat greater than the space afforded between the upper side pieces 17 and 18, and the lower ends of the abutments or separators 32 are thickened to fill this space and shaped so as to present inclined faces 3.4 which conform with 'the beveled faces '35 formed at the bot-toms of the upper side pieces 17 and 18. e

Thetongue 26 of the base piece 15 is cut away or relieved at each side directly beneath each mold'cavity 19, thus providing slightly inclined walls 86 which form venting or relief passages 37 with the inner faces of the two lower side pieces 16, through which passages gas may escape from the mold .cavities 19 to the atmosphere, the escape being made possible by reason of the provision of a plurality of' V-shaped ducts 38 formed on the inner faces of the lower side pieces and communicating with vents or ports 39 formed in and extending through the lower side pieces. It will also be noted that the tongue 26 of the base piece is cut awayv to provide a plurality of depressions 40, each of which is equal in length to the length .-of the mold cavity. The

cutting away of or relieving the tongue 26 central longitudinal plane passing vertically through the several mold cavities. 'These inclined faces are provided so that the cutting elements, when placed within the mold cavities along the bottom margin thereof,`

normally tend to lie against the inner faces of the lower side pieces 16; and they are also provided so as to direct the molten metal, when introduced into the mold cavities, outwardly from the center line ofthe cavities towards theinner faces of the lower side pieces 16. By so directing the molten lill metalits flow is utilized toE further urge the cutting element 48 to the outer Vmargins of the mold cavities 'and Vto maintainV them Vso positioned until the metal has sufficiently hardened to prevent their displacement. In

order thatthe molten metal may be permitted to flow completely around the cut-- ting elements 48 and may thus insure that they wiil be 'effectively embedded in the metal ofthe teeth and held firmly` in their.

leaver the cutting elements surrounded` by'v metal. Y y

rIn order to' retain the cutting elements against their tendency to Heat upward when the 'molten metal is 'introduced into the mold cavities 19, a' retaining element 46 is provided, in the for'm of a wire gauze or screen.' 'This' retaining` 'element is suiiicient in 'width' to reach-from the inner tace of one ot' the lower side pieces tothe inner 'tace' ot' the-other lower side piece Aand is suiiiC-ient' in length to overlie the'margins ot the tongue Q6' adjacent the several' webs 41, thek overlying end portions of the retaining element being clamped against the tongue 26 by vthe lower'fends of the abutnients orsepara'tors 82 and 82', which project into the space `aiiorded between the lower side pieces 16. The metal 'from which the gauze or screen 46 isV formed may be such that it fuses with the molten metall as itis introduced into the several mold cavities and thus becomes an integral part of the'finished saw teeth.

The upper side pieces 17 and 18 at their upper portions are cut away or relieved, as

lshown at 47, to 'provide gates or passages through which the molten metal is poured into the several mold cavities 19, the walls of the gates being so shaped and inclined as 'to merge with the inner faces of the upper low the upper `faces of 'the vupper side pieces Y .17 and 18. By reason of the facty that the cracking edges 49 are located below the-'up-V per faces of theupper side members 17"'and 18 and'since the abutments orl separators-32 project Aan appreciable dist-ance above'the upper facesl of theside members,'any overtlow or excess metal at'the end of the-pouring operation (and to insure thelling'of the mold aneXcess' is f usually` poured) A"is necessarily directed' tothe overfiow'cliannels 48, and, in soldifying, is'cracked Vor broken loose at its point ofrunion with the cast metal by reasonk of the shrinkage of the metal within the mold, which shrinkage exerts a downward pull against thecracking dges 49 so as to crack or break vthe overhanging tongue of overflow metal without setting up any undue stresses or'strains A within the metal inr the' moldi This" tongue and the metal at the., gate are usually removed in finishing the tooth 'andtlius all parts of the casting,thathaveibeensub jected to undue strain 'during the casting operation are removed in the productionof the'finished tooth. f The upper side piece 17 is provided at its lower edge with notches 50k and 51' and lthe upper side piece 18 is provided atY its lower edge with notches 52 and Each ofthe lower side pieces 16 is providedat its upper edge with notches 54 and 55. Vhen it is desired to so adjust the abutments or separa'- tors82, 32,as to mold teetlroi say seven,- eighths of an inch in width` the: twonpper side pieces 17 and 18 are so adjusted, when in a race to face relation with eachother, as to bringthe notches 51 and 53 into aline-A ment or registration with each other,as shown in 'Figures 1, 6 andv 8. 'A'base piece 15, marked V8 inch, as shown inv Figure 8. isassembled with the lower side pieces 16 and is locked thereto by means oi the transverse' lag-boltsQl, This base Vpiece 15 is provided with a 'single notch 56, 'which -registers with the alined notches' 55 of lthe lower side piecesso lthat a pin 56A (see Figs. 1 andV 15) may 'be passed through' these notches 55` 56` and the 'notches V51 and 58, when the latter are ment, and this is only true 4when the relative positions of the upper side. pieces 17 Vand 18 are such as to forminoldfcavities for seven-eighths inch teeth. The base piece 15 marked l inch 7 has no other notch than-the, notch 56gand thereforelias' a Isolidk portion 57, as shown in Figure 8, which obstructs the passage of the pin through the notches 54 of. the lower side pieces 16, and therefore prevents the pin from I being passed through thesev notches. It is'th'erefore apparent that. when the base piece 15, marked 7/8 inch is assembled with the in alineflower side pieces 16, rthe assembled. parts can be'adjusted only to producea" toothsev'eneighths of an inch wide. Further the base piece marked 7/8 inch l has depressions 4:0 and webs Z11 properly dimensioned for sevenseighths inch mold cavities, so that. the mold cavities are in all respects adapted to cast seven-eighths inch teeth.

Vhen it is desired to adjust the parts of the mold for molding teeth say one inch wide. another base piece 15 marked 1 inch (see Fig. 9), is assembled with the lower side pieces 16 in place of the base piece 15. This base piece 15 has a single notch 56, which is in alinement with the notches 511 of the lower side pieces 16 and therefore has a solid portion 58, as shown in Figure 9, which projects across the passageway formed by the notches ofthe lowei side pieces and prevents the pin 56 from being passed through these notches 55. The pin, therefore` can only function by insertion through the notches 54 and this only if the upper side piece 18 has been so adjusted as to bring the notches 50 and 52 into alinement, as shown in Figure 9. This base piece marked1 inch has depressions Ll-O and webs 41 properly dimensioned 'torrone inch mold cavities, so that the mold cavities are in all respects adapted to cast one inch teeth.

While I have shown only two base pieces 15 and 15, for insuring two adjustments of the upper side piece 18, it will be understood that other base pieces may be provided which are so notched and are provided with depressions and webs of such dimensions as to enable other relative adjustments to be made of the upper side members, which will also be suitably notched for the different adjustments.

Not only is accuracy made possible by the structure above described. but speed is also made possible in assembling the molds and mistakes are avoided, as will be readily appreciated.

Referring to Figures 10 and 11, wherein is shown a modified form of venting mea-ns, vthe tongue 26 of the base piece 15 is not relieved or recessed at its sides for the escape of gas but is provided with a plurality of relief passages or vents 59, which extend vertically throughout the tongue and establish communication between the mold cavities 19 and the groove 2&1 formed in the b-ase piece 15.

Referring to Figures 12 and 13. wherein another form of venting means is shown` the two lower side pieces 16 are provided longitudinally of their lengths with grooves or channels 60, which extend throughout the length of the mold. rlhese grooves or channels 60 communicate with the several mold cavities 19 through the relief passages 37 such as heretofore described formed intermediate the tongue 26 and the side members 16', and serve to permit the gases within the mold cavities 19 to escape from the mold atV opposite ends thereof. The base piece 15 is of the same construction as shown in Figures 1 to 5, and as heretofore described.

In order to maintain the cutting elements 43 properly spaced from the ends of the mold cavities so that the teeth when removed from the mold may be milled or otherwise finished at their ends without detriment to the cutting elements. a pair of yoke-shaped spacers 61 may be provided, as

` shown in Fig. 14. These spacers are adapted 'and the'material being sawed, to reduce friction and facilitate ease in operation.

Having 'thus described certain embodiments 'ef the invention what is claimed is:

1. In a mold for saw teeth, side pieces, one of said side pieces being recessed at its top to provide an overflow channel present ing a cracking edge and both of said side pieces forming` side walls for the m'old cavity, said cavity being enlarged at its bottom, whereby moltenm-eta-l upon cooling and shrinking within such cavity is so held as to effect a cracking of solidified metal by said cracking edge. H

2. In a moldv for saw teeth, side pieces forming side walls for the mold cavity, one of said side pieces being recessed at its'top to provide an overflow channel presenting a cracking` edge and both 4of said side pieces losingy relieved at their upper ends to form an inlet gate having inwardly converging walls which are only slightly inclined with respect to'sad side walls so as to permit unrestricted downward shrinkage Vof theY molten metal upon cooling, said cavity being enlarged at its bottom whereby molten metal upon cooling and shrinking withinV such y cavity is so held as to effect a cracking of solidified metal by said cracking edge.

3. In mold for saw teeth, a pair ofupper side pieces forming the side walls ot' a mold cavity, a pair of lower side pieces upon which said upper side pieces are arranged. means forming the end walls of the mold cavity, a base piece associated with said lower side pieces and having a-tongue forming the bottom. of the mold cavity, said tongue being cut away Vto provide arelief passage and said sidevpieces being provided with gas ducts communicating with said passages to permit the escape of gas' from the mold.

which may bre varied upon adjustment of' said side pieces, a base piece forming` the bottom ol: said moldcavity, and means adapted to cooperate With said base piece and said side pieces tor insuring a prede termined adjustment of said side pieces.

5. In a mold, the combination with a pair of separators, a pair of laterally adjustable side pieces, each of which is secured to one of said separators, said separators and said side pieces forming a mord cavity the capacity of which may be varied upon adjustment of said side pieces, a plurality of base pieces either of which is adapted to be associated With said side pieces to form the botcom of said mold cavity` and selective means adapted to cooperate with said side pieces and'Joue of said base pieces to insure a given adjustment of said side pieces, said selective 'i means being adapted also to cooperate With said side pieces and another of said base pieces to insure another given adjustment of said side piece. v

6. In a mold for saw teeth, a pair of side pieces, a base piece having` a tongue arranged intermediate said side pieces and forming the bottom of the mold, said tongue being provided with inclined faces adapted to receive and support thereupon cutting elements to be embedded in the molten metal as it is introduced into the mold.

7; In a mold for saw teeth, a pair of side pieces, a base piece having a tongue arranged intern'iediate said side pieces and forming the bottom ot' the mold, said tongue being provided With inclined faces meeting each other centrally of the mold and adapted to receive thereupon cutting elements to be embedded in the molten'metal as it is introduced into the mold.

[n testimony whereof, I have aixed signature to this speciication.

' VICTOR A. T. ALBRIGHT. 

